Optical design of visible emission line coronagraph on Indian space solar mission Aditya-L1

Kumar, Nirmal; Prasad, B. Raghavendra; Singh, Jagdev; Venkata, Suresh

doi:10.1007/s10686-017-9569-7

Cited by 19 publications

(15 citation statements)

References 10 publications

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“…A pixel size of 6.5 μm for the visible spectral channels and 25 μm for the IR channel result in pixel scales of 1.25 arcsec pixel -1 and 4.8 arcsec pixel -1 , respectively. It should be realized from the optical layout of VELC (Figure 1 in Kumar et al, 2018) that the set of four slits in the slit plane placed in the optical path is incident on the spectrograph. We vary the slit width as 20, 40, and 60 μm and investigate their effects on the instrument output (see Section 3).…”

Section: Synthesizing Spectramentioning

confidence: 99%

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Characterizing Spectral Channels of Visible Emission Line Coronagraph of Aditya-L1

Patel¹,

Megha²,

Shrivastav³

et al. 2021

Front. Astron. Space Sci.

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Aditya-L1 is India’s first solar mission with the Visible Emission Line Coronagraph (VELC), which consists of three spectral channels taking high-resolution spectroscopic observations of the inner corona up to 1.5 Rʘ at 5,303, 7,892, and 10,747 Å. In this work, we present a strategy for the slit width optimization of the VELC using synthetic line profiles by taking into account the instrument characteristics and coronal conditions for log(T) varying from 6 to 6.5. The synthetic profiles are convolved with simulated instrumental scattered light and noise to estimate the signal-to-noise ratio (SNR), which will be crucial to designing the future observation plans. We find that the optimum slit width for VELC turns out to be 50 μm, providing sufficient SNR for observations in different solar conditions. We also analyzed the effect of plasma temperature on the SNR at different heights in the VELC field of view for the optimized slit width. We also studied the expected effect of the presence of a CME on the spectral channel observations. This analysis will help to plan the scientific observations of VELC in different solar conditions.

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Section: Synthesizing Spectramentioning

confidence: 99%

“…where the area of the VELC primary is obtained by taking the diameter of the primary mirror as 195 mm (Kumar et al, 2018).…”

Section: Synthesizing Spectramentioning

confidence: 99%

Characterizing Spectral Channels of Visible Emission Line Coronagraph of Aditya-L1

Patel¹,

Megha²,

Shrivastav³

et al. 2021

Front. Astron. Space Sci.

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“…There is almost no transmission above 8000 Å, which means that IR lines cannot be observed. For instance, the IR lines (FeXI 7892 Å and FeXIII 10747 Å) planned to be observed by the future Visible Emission Line Coronagraph (VELC) onboard the indian Aditya-L1 mission (Raj Kumar et al (2018), Raghavendra Prasad et al (2017)) are not accessible to the SLED, but coordinated campaigns could be organized in the FeXIV 5303 Å line with both instruments. The sCMOS camera has a quantum efficiency greater than 0.5 over the wavelength range 4250 -8000 Å and the overall transmittance of the SLED is reported in Figure 15.…”

Section: The Sled Optical Designmentioning

confidence: 99%

The Solar Line Emission Dopplerometer project

Malherbe,

Mein,

Sayede

et al. 2021

Preprint

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Observations of the dynamics of solar coronal structures are necessary to investigate space weather phenomena and global heating of the corona. The profiles of high temperature lines emitted by the hot plasma are usually integrated by narrow band filters or recorded by classical spectroscopy. We present in this paper details of a new transportable instrument (under construction) for imaging spectroscopy: the Solar Line Emission Dopplerometer (SLED). It uses the Multi-channel Subtractive Double Pass (MSDP) technique, which combines the advantages of both filters and narrow slit spectrographs, i.e. high temporal, spatial and spectral resolutions. The SLED will measure at high cadence (1 Hz) the line-of-sight velocities (Doppler

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“…VELC has the facility of multi-slit spectroscopy at three emission lines 5303 Å [Fe XIV], 7892 Å [Fe XI] and 10747 Å [Fe XIII] with a spectral resolution of 28 m Å/pixel, 31 m Å/pixel and 202 m Å/pixel, respectively in FOV 1.05Ro to 1.5Ro with an image scale of 1.25 arcsec/pixel. VELC also has a dual-beam spectro-polarimetry channel for magnetic field measurements at 10747 Å (Prasad et al (2017) [2] and Kumar et al (2018) [1]). The payload has four detectors (three sCMOS and one InGaAs ) to enable imaging, spectroscopic and spectro-polarimetric observations simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Data Pipeline Architecture and Development for VELC onboard Space Solar Mission AdityaL1

Singh,

Prasad,

Sumana

et al. 2022

Preprint

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ADITYA L-1 is India's first dedicated mission to study Sun and its atmosphere with Visible Emission Line Coronagraph (VELC), a major payload on ADITYA-L1. VELC has provision to make imaging and spectroscopic observations of the corona, simultaneously. Imaging with the Field of View (FOV) from 1.05Ro to 3Ro will be done in continuum at 500nm. The spectroscopic observations of solar corona in three emission lines, namely 5303 Å [Fe XIV], 7892 Å [Fe XI], 10747 Å [Fe XIII], and Spectropolarimetry at 10747 Å [Fe XIII] will be performed with FOV of 1.05-1.5Ro. In this work, the end-to-end data pipeline architecture and development of the VELC payload are presented. The VELC proposal submission form, satellite observation parameters, data products, level definitions, data pipeline and analysis software to process the big raw data sets obtained using VELC instruments onboard satellite to science-ready data are discussed.

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Optical design of visible emission line coronagraph on Indian space solar mission Aditya-L1

Cited by 19 publications

References 10 publications

Characterizing Spectral Channels of Visible Emission Line Coronagraph of Aditya-L1

Characterizing Spectral Channels of Visible Emission Line Coronagraph of Aditya-L1

The Solar Line Emission Dopplerometer project

Data Pipeline Architecture and Development for VELC onboard Space Solar Mission AdityaL1

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